The Celts' Stable can provide a reasonable army of cavalry, but they lack Camels and important upgrades such as Bloodlines and Plate Barding Armor. However, one of the cons of the Celts is their Archery Range, which is quite lacking and rarely used, seeing as it lacks the Arbalest, Thumb Ring, and Parthian Tactics upgrades, and their Blacksmith lacks the final archers' upgrades, Bracer and Ring Archer Armor. So with their fast infantry and powerful siege units, they are good against other infantry and for raiding. The gold saved can be used to create more siege weapons. The Celts' unique unit is the Woad Raider, which is the fastest infantry in the game and costs little gold. They also possess the fastest infantry in the game, allowing their Spearman line to be a much greater threat to Knights, and allows their other infantry to stage fast raids on settlements.
Their siege units are some of the best in the game, with the fastest creation speed, the greatest HP and fastest fire rate. The Barracks has all infantry units available, except the Eagle line units, and they have access to all Siege Workshop upgrades, except Bombard Cannon. The Celts are an infantry civilization with powerful siege weapons and very good infantry.